Title XVIII LABOR AND INDUSTRIAL RELATIONS Chapter 293 • Effective - 28 Aug 1959, 2 histories 293.120. Air safety requirements. — Air in which men work or travel in mines shall be improved when: (1) It contains less than nineteen and five-tenths percent oxygen; (2) It contains more than one-hundredth percent carbon monoxide; (3) It contains more than five-tenths percent carbon dioxide; (4) It contains more than one percent methane; or (5) Is contaminated with dust or with noxious or poisonous gases in excess of accepted limits as established by the director of the division of mine inspection. -------- (L. 1959 S.B. 188 § 13)
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